[Webkit-unassigned] [Bug 132486] Web Inspector: horizontally scrolling the timelines overview is slower as range selection grows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=132486

Brian Burg <bburg at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Web Inspector: horizontally |Web Inspector: horizontally
                   |scrolling the timelines     |scrolling the timelines
                   |overview is choppy          |overview is slower as range
                   |                            |selection grows
                URL|                            |http://www.cnn.com

--- Comment #6 from Brian Burg <bburg at apple.com> ---
STEPS TO REPRODUCE:

 * Go to CNN.com
 * Open Inspector
 * Force-reload
 * Wait for auto-recording to stop (20s)
 * Open timelines panel
 * Zoom in on timelines overview (using wheel / trackpad)
 * scroll horizontally with wheel, trackpad, or dragging scrollbar
 * select a small range of the timeline, and scroll horizontally again

EXPECTED:

 * horizontal scrolling speed shouldn't be affected by the size of the selection range.

ACTUAL:

 * as the selection becomes wider, horizontal scrolling has worse performance.


NOTES:
 * Maybe we are doing work we shouldn't be doing- that's O(records in range) - when the view range changes.

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